Atomic structure and the periodic table

This video explains the periodic table, which contains all the known elements.

This video is an interactive lesson in calculating an atom's mass and atomic number.

Big Manny explains the history of the development of the atomic model

Big Manny explains the difference between an element’s atomic number and mass number

Big Manny explains the electronic structure of an atom

Big Manny explains how paper chromatography is used to separate mixtures of soluble substances